Cap for lamp-sockets and the like.



C. J. KLHN.

CAP FOR LAMP SOCKETS AND THE LIKE. APPLICATION FILED mm. 1922.

Patentml Apr. 13, 1915.

CHARLES J'. KLEIN, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO THE CUTLER-HAMMER MPG;- 60., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCON'IIN.

CAP ron'LAMr-socxms AND THE LIKE.

Specification of Letters Patent.

Patented Apr. 13,1915.

Application filed April 8, 1912. Serial No. 689,288.

To all whom it may concern:

Be it known that 1, CHARLES J. :KLEIN, a citizen of the United States, residing at Milwaukee, in the county of Milwaukee and State of Wisconsin, have invented new and useful Improvements in Caps for Lamp- Soclrets and the like, of which the following is a-full, clear, concise, and exact description, reference being had to the accompanying drawing, forming a part of this specification.

My-invention relates to improvements in caps for lamp sockets, pendant switches and devices of a similar character.

It is one of the objects of my invention to provide a cap which will not require the use of a separate insulating lining therefor.

A further object is to provide a cap of solid insulation with a metallic shellelrgaging portion. p

A further object is to provide a cap of solid insulation having a metallic fixture engaging portion. v

A further object is to provide a cap having a metallic shell engaging portion and a metallic fixture engaging portion insulated from one another.

A still further object is to provide a cap f the character described having exteriorly the finished appearancc of an ordinary metallic cap.

Other objects and advantages will be hereinaftcr set forth.

For the purpose of disclosing the nature and chariu'teristic features of my invention, I shall describe the embodiments thereof illustrated in the accompanying drawin it should be understood however, that my invention is not limited to the specific cm l 'ulil\l01ll15 theicof'sclccted for the purpose of illustration.

In the zu-con'ipanyingdrawings:Figure 1 is a vertical sectional view through one form of tag). Fig. 2 is abottom plan view of Fig. l. and Fig. 3 is a vertical sectional view through a modified form of cap.

The cap shown in Fig. 1 is particularly suitz'iolc for use in lamp sockets but might be Hsctl in other devices. It includes a dome shaped solid insulating member 1 to which are secured metallic parts as willbe later described. The member '1 forms the body of the cap and is accordingly preferably of a substantial character. It may be formed of any suitable material and in any desired thereto in any desired; manner.

manner. In practice, however, I prefer to form this member of porcelain or some other molded material. The member 1 is provided with a suitable central opening 2 for the passage of wires therethrough.

.At its lower end the member 1 is provided with an angularl-y disposed annular metallic rini 3 which in practice may be secured I prefer, however, to provide the rimSWith a perpendicularly disposed annular flange 1 and to mold said llange in the insulating body. during the formation of the latterl This produces a unitary, strong and durable structure. If desired the flange may be provided with a roughened or irregular surface or provided with a series of perforations (shown in dotted lines) to augment the grip of themolded material thereon.

The flange 3 supports or carries a shell engaging member 5. The member 5 is of the same construction as that shown in my copending application, Serial No. 660,345, filed Nov. 15, 1911, and is secured to the rim 3 in the same manner. Of course in practice the member 5 might be of any other desired form an secured to the rim 3 or directly to the insiihiting member 1 in any desired inanner.

At its top the insulating member 1 is provided with a metallic threaded nipple 6 axially alined with the opening 2. The nipple 6 is provided with a flange 7 shaped to closely fit upon the member .1 and said flange is rigidly secured to said member 1 by rivets giving the cap the finishedappearance of a solid metallic structure.

The cap thus provided has all of the advantages of the ordinary solid inctal caps and further has'additional advantages. The insulating member 1 presents aneintt'rior insulating surface which obviates thc uecessity of providing a separate or special insulating thereto without danger of injuring any of .the parts thereof. This obviates the nuisance of having to remove the insulating lining of ordinary caps before subjecting the same to such treatment.

The cap shown in F ig; 3 differs from that shown in Figs. 1 and 2 only in omission of the metallic covering for the insulating member and the provisionof an integralinsulating nipple 10 for the metallic nipple of the former structure. Such a cap is particularly adapted for use in pendant switches" and'the-like Where a threaded nipple is not required. Obviously,.however, a metallic threaded nipple might be secured within the insulating nipple 10 if desired, thus adapting the device to the same uses as the cap shown in Figs. 1 and 2.

What I claim as new and desire by Letters Patent is:

lrA cap for lamp sockets and the like to secure comprising a metallic dome member, an in-' sulating lining member secured therein and an annular metallic shell engaging member fixed to said insulating lining member.- i 2. A cap for lamp sockets and .the.liko comprising a metallic dome member, an insulating lining member secured therein and a metallic shell engaging member fixed to 4(.

said linmg-v dome memsaid insulating linin member, member insulating said metallic ber fiom said metallic shell engaging member.

3. A casing cap eomprising a body part of insulating material, a metal ring rigidly fixed in the margin of said body part, and'a metal shell engaging rim rigidly fixed to said ring, said rim locking shoulders.

4. In combination, a dome member of rigid insulation having an opening for con ductors a metal bushing alined with said opening and rigidly fixed to said member fo attaching the same to a suit-ablesupport,

having thereon integral and a metal'rim rigidly and permanently fixed to said member and spaced from. said bushing! Said rim being-adapted to receive a metal shell member and having thereon in tegral shoulders for releasably locking with such shell member.

5. In combination, an insulating member, a threaded metal bushing li'xed thereto for attachment to a suitable support, and an annular metal rim permanently secured to said memberand spaced from said bushing, said rnnv being adapted to receive a metal shell and said member serving to insulate said rim and the shell received thereby from said bushing and the attached support.

In witness whereof, I have hereunto subseribed my name in the presence of two wit nesses. V

CHARLES J. KLEIN.

\Vitnesses -FRA.E\K H. HUBBARD, H. L. RoCKwELL. 

